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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <stdio.h>
#include "types.h"
#include "netdb.h"
#include "socket.h"
#define import_kernel
#define import_knames
#define import_spp
#include <iraf.h>
#define MAXALIASES 35
#define MAXADDRSIZE 14
#define LINSIZ 80
static int hostf = NULL;
static char line[LINSIZ+1];
static char hostaddr[MAXADDRSIZE];
static struct hostent host;
static char *host_aliases[MAXALIASES];
static char *tcp_locate();
/* TCP_GHOSTENT -- Return the next entry (line) in the host name table
* decoded into a hostent structure.
*
* The format of an entry in the host name table (e.g., /etc/hosts on a UNIX
* system) is as follows:
*
* ddd.ddd alias1 alias2 ... aliasN
*/
struct hostent *
tcp_ghostent()
{
register char *cp, **q;
u_long tcp_inetaddr();
char *p, *tcp_hostdb();
char *ku_fgets();
if (hostf == NULL && (hostf = ku_fopen (tcp_hostdb(), "r" )) == NULL)
return (NULL);
again:
if ((p = ku_fgets (line, LINSIZ, hostf)) == NULL)
return (NULL);
eprintf("..%s", line);
if (*p == '#')
goto again;
cp = tcp_locate (p, "#\n");
if (cp == NULL)
goto again;
*cp = '\0';
cp = tcp_locate (p, " \t");
if (cp == NULL)
goto again;
*cp++ = '\0';
/* THIS STUFF IS INTERNET SPECIFIC.
*/
host.h_addr = hostaddr;
*((u_long *)host.h_addr) = tcp_inetaddr (p);
host.h_length = sizeof (u_long);
host.h_addrtype = AF_INET;
while (*cp == ' ' || *cp == '\t')
cp++;
host.h_name = cp;
q = host.h_aliases = host_aliases;
cp = tcp_locate (cp, " \t");
if (cp != NULL)
*cp++ = '\0';
while (cp && *cp) {
if (*cp == ' ' || *cp == '\t') {
cp++;
continue;
}
if (q < &host_aliases[MAXALIASES - 1])
*q++ = cp;
cp = tcp_locate (cp, " \t");
if (cp != NULL)
*cp++ = '\0';
}
*q = NULL;
return (&host);
}
/* TCP_OPHNT -- Open the host name table, a text file.
*/
tcp_ophnt()
{
char *tcp_hostdb();
eprintf ("ophnt %s\n", tcp_hostdb);
if (hostf == NULL)
hostf = ku_fopen (tcp_hostdb(), "r");
}
/* TCP_CLHNT -- Close the host name table file.
*/
tcp_clhnt()
{
if (hostf) {
ku_fclose (hostf);
hostf = NULL;
}
}
/* TCP_LOCATE -- Return a pointer to the first character in the indicated
* character class.
*/
static char *
tcp_locate (cp, match)
register char *cp;
char *match;
{
register char *mp, c;
while (c = *cp) {
for (mp = match; *mp; mp++)
if (*mp == c)
return (cp);
cp++;
}
return ((char *)0);
}
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